CN105765168A

CN105765168A - Radial tie-bolt support spring

Info

Publication number: CN105765168A
Application number: CN201480064701.XA
Authority: CN
Inventors: B.V.拉韦; R.C.冯德埃施; J.F.佩皮; D.W.克拉尔
Original assignee: General Electric Co
Current assignee: General Electric Co
Priority date: 2013-11-26
Filing date: 2014-11-25
Publication date: 2016-07-13
Anticipated expiration: 2034-11-25
Also published as: CN105765168B; EP3074598A1; BR112016011884A2; WO2015081037A8; JP2017502189A; EP3074598A4; CA2930561A1; WO2015081037A1; US20160376889A1; US10508547B2

Abstract

According to some embodiments, a tie-bolt support assembly is provided which includes a support spring for engagement with both the tie-bolt and a rotor assembly to maintain a load path between the tie-bolt and the rotor assembly while also allowing for axial movement of the tie-bolt.

Description

Radially tie bolt supporting spring

The cross reference of related application

The request of this PCT utility application is enjoyed has U.S. Patent Application Serial the 61/909th, the title of No. 069 is priority and the rights and interests of the currently pending provisional application of " RadialTie-BoltSupportSpring " and the submission date with on November 26th, 2013, and it is all through in being incorporated herein by reference.

Technical field

The present embodiment relates generally to gas-turbine unit.More specifically, the present embodiment relates to, but are not limited to radially tie bolt supporting spring, and it increases the natural frequency of tie bolt system by the lateral load path between offer tie bolt and rotor structure around.

Background technology

Typical gas-turbine unit generally has front-end and back-end, and wherein its some cores or propulsion members are axially positioned betwixt.Air intake is positioned at the front end place of electromotor.Rearward end moves in order, is fan, compressor, combustor and turbine after air inlet.From it will be readily apparent to one skilled in the art that additional component may additionally include gas-turbine unit, as such as, low pressure and high pressure compressor and low pressure and high-pressure turbine.But, this is not detailed inventory.

Compressor and turbine generally include the rows of airfoil of stacking staged vertically.The circumferentially spaced stator vanes of row and one that include at different levels arrange rotor blade, and it rotates around high pressure or the low-pressure shaft of gas-turbine unit.Multistage low-pressure turbine is after multistage pressure turbine, and is typically linked to the fan of low pressure compressor upstream being arranged in typical turbomachine fan aircraft engine structure by low-pressure shaft, for aloft aircraft energy supply.

Stator is formed by multiple nozzle segment, and the plurality of nozzle segment abuts against circumference end place, to form the whole ring of the axis around gas-turbine unit.Each nozzle segment can include the single stator vanes being commonly referred to monomer.Alternately, nozzle segment can have two stator vanes of each sections, and it is generally known as binary.In the third embodiment, the stator of additives amount may be provided on single sections.In these embodiments, stator extends between interior band and tyre.

In operation, high-pressure turbine and low-pressure turbine act as and make energy maximize from the extraction of high-temperature combustion gas.Turbine typically has along the axially disposed high pressure of the central longitudinal axis of gas-turbine unit or low-pressure shaft.Airfoil shape rotor blade is circumferentially distributed on rotor, causes interior axle by the rotation with the interaction of combustion exhaust gases.

Low-pressure shaft and high-pressure shaft are connected to rotor and air compressor so that rotation input is provided to high pressure and low pressure air compressor by turbine respectively, to drive compressor blade.This is during operation to compressor energy supply, and with rear drive turbine.When burning gases are downstream through stage of turbine, energy extracts from it, and the pressure of burning gases reduces.

Some gas-turbine units utilize tie bolt, and it can in axial direction extend through gas-turbine unit.Tie bolt can be used for being connected to each other by one or more compressor module and/or more turbine module.Tie bolt can allow turbine module to remove, and does not disassemble compressor module.Current tie bolt system can have various natural frequency, and under these various natural frequencies, tie bolt can laterally deflect and turn round around engine centerline, is similar to " rope skipping " action.

About present example, spanner nut can be used for the connection kept between the axially rear of compressor and the axial midpoint of tie bolt.When turbine module removes from gas-turbine unit, this type of spanner nut allows compressor to keep its assembled state.Spanner nut also improves the rigidity of tie bolt, to suppress or to increase the natural frequency of this type of " rope skipping pattern ".But, the rotor structure needed for using this midpoint spanner nut is relatively heavy component, if it removes, will cause the engine performance improved.Although by it is desirable that reduce the weight that is associated with spanner nut, but the removing of spanner nut reduces the rigidity of tie bolt, it is allowed to the lateral vibration of increase is moved.Lateral movement is defined to the displacement of a part (generally concentric with rotor) for component or component so that the centrage of component no longer overlaps with whole rotor centerline.

By it is desirable that improve these states to reduce the weight of midpoint spanner nut assembly by not transmitting the side loading of tie bolt, and also do not reduce the natural frequency of tie bolt.

It is included with reference to purpose merely for technology including the information (including any list of references cited herein and its any description or discussion) in the background section of description, and the theme that the scope being not considered as the present embodiment is defined by it.

Summary of the invention

According to some embodiments, it is provided that a kind of tie bolt bearing assembly, it includes the supporting spring for engaging with tie bolt and rotor assembly, to keep the load paths between tie bolt and rotor assembly, also allows for moving axially of tie bolt simultaneously.

According to some other embodiments, tie bolt bearing assembly includes Axial Flow Compressor, it has multiple rotor disk and the multiple rotor blades extended from rotor disk, extends axially through the tie bolt of Axial Flow Compressor, tie bolt has circumferential recess that the external diameter around tie bolt extends, arranges in a groove and the spring that can move axially in groove, wherein spring engages at least one in multiple rotor disks, to keep the radial force at least one rotor disk.

All features outlined above are understood to exemplary only, and the more features of tie bolt bearing assembly and purpose can be collected from disclosing herein.This general introduction provides into the selection introducing design in a simplified manner, and it is described further below in detailed description.This general introduction is not intended to identify key feature or the basic feature of the theme of prescription, is intended to be used to the scope of the theme of restriction prescription.The broader following written description being set out in various embodiments of the present invention of inventive feature, details, practicality and advantage provides, shown in the drawings, and limit in the following claims.Therefore, the non-restrictive explanation of this general introduction will be understood when not reading the entire specification, the claims and drawing that therewith include further.

Accompanying drawing explanation

The feature and advantage with other mentioned above of these exemplary embodiments, and the mode obtaining them will become more apparent from, and tie bolt bearing assembly feature will be best understood from by referring to being described below of embodiment carried out in conjunction with accompanying drawing, in the figure:

Fig. 1 is the schematic side elevational cross sectional view of exemplary gas turbogenerator；

Fig. 2 is the schematic diagram of the first embodiment of tie bolt assembly；

Fig. 3 is the detailed maps of the tie bolt assembly including spring；

Fig. 4 is the embodiment of as directed Fig. 3, and wherein spring is in bending position；

Fig. 5 is the isometric view of spring；

Fig. 6 is the axial view of alternative spring embodiment；And

Fig. 7 is the side cross-sectional view of another alternative spring with reverse structure.

Detailed description of the invention

Reference will now be made in detail to now the embodiment provided, its one or more example is shown in the drawings.Each example provides via explaination, and is not intended to disclosed embodiment.It practice, to those skilled in the art it would be apparent that various remodeling and modification can be made in the present embodiment, without deviating from the scope of the present disclosure or spirit.Such as, the feature of the part being illustrated or described as an embodiment can use also to produce further embodiment together with another embodiment.Therefore, it is intended that the present invention covers this type of remodeling and modification in the scope falling into claims and their equivalent.

With reference to Fig. 1-7, the various embodiments of gas-turbine unit have tie bolt bearing assembly.Assembly alleviates the weight of rotor, provides lateral-supporting to tie bolt simultaneously and resists asymmetric deflection, wherein the centrage transfer of tie bolt.

As used in this article, term " axially " or " axially " refer to the size of the longitudinal axis along electromotor.The term " front " used together with " axially " or " axially " refers to and moves along towards the direction of motor inlet, or component compared to another component relatively closer to motor inlet.The term " afterwards " used together with " axially " or " axially " refers to that edge is moved towards the direction of engine nozzle, or component compared to another component relatively closer to engine nozzle.

Referring initially to Fig. 1, it is shown that the schematic side elevational cross sectional view of gas-turbine unit 10.The function of gas-turbine unit 10 is in that from high pressure and high-temperature combustion gas extracting energy, and converts the energy into mechanical energy for working.Gas-turbine unit 10 has motor inlet end 12, and its air enters core propeller 13, and it is generally limited by high pressure compressor 14, burner 16 and multistage pressure turbine 20.Jointly, core propeller 13 provides thrust or power during operation.Gas-turbine unit 10 can be used for aviation, generating, industry, boats and ships etc..

In operation, air enters through the motor inlet end 12 of gas-turbine unit 10, and moves through at least one compression stage, and wherein, air pressure increases and guides to burner 16.The air of compression mixes with fuel, and burns, it is provided that hot combustion gas, it leaves burner 16 towards high-pressure turbine 20.At high-pressure turbine 20 place, energy extracts from hot combustion gas, causes turbo blade to rotate, and this causes the rotation of axle 24 then.Axle 24 is towards the front portion process of gas-turbine unit, to continue the rotation of one or more high pressure compressor 14 grades.Low-pressure shaft 28 extends between low pressure compressor 22 and low-pressure turbine 21.Turbofan 18 or inlet fans blade depend on that turbine design also can be connected to low-pressure turbine 21 by low-pressure shaft 28, and produce the thrust for gas-turbine unit 10.Low-pressure turbine 21 can also be used for extracting other energy, and to additional compressor stage energy supply.

Referring now to Fig. 2, depict the schematic diagram of the first embodiment of tie bolt assembly 30.Tie bolt assembly 30 provides high pressure compressor 14 module and/or turbine 20 module separable joint by non-screwed joint.This configuration eliminates the flange of turbine and relatively heavy compressor module and bolt connects.Tie bolt assembly 30 provides the axial holding of separable rotor component by applying compressive load via tie bolt assembly 30.Tie bolt 31 is tubular section, and axially extends and extend to from the front end rearward end of high pressure compressor 14 turbine 20.

High pressure compressor 14 includes rotor assembly 15, they multiple blades 34 including being all connected to rotor disk 32.Rotor disk 32 extends in a radial direction in the view drawn.Rotor assembly 15 also includes multiple protruding 36, and it extends between rotor disk 32 and extends at blade 34 radially inner side.As it is further described, the supporting spring 60 (Fig. 3) of the present embodiment may be positioned to dock between rotor disk 32 with tie bolt 31 and other position.

Referring now to Fig. 3, depict the detailed maps of tie bolt assembly 30 in the high pressure compressor 14 (Fig. 1) near the various rotor disks 32 of rotor assembly 15.Tie bolt assembly 30 in axial direction extends, and multiple rotor disk 32 is plotted as and radially extends about from the outer surface 40 of tie bolt assembly 30.Tie bolt assembly 30 can be arranged in every way, in order to avoid touching rotor disk 32.Such as, rotor disk 32 can have hole, and tie bolt assembly 30 is through this hole.Rotor disk can be connected to tie bolt assembly 30 in many ways.Blade 34 is at the radial outer end place of rotor disk 32.Blade 34 is shown as and is connected to rotor disk 32 with dovetail layout, and wherein rotor disk 32 and blade 34 are mechanically connected.But, these structures can also be combined and are shaped as leaf dish layout, and it can be recognized as the unitary construction of dish and blade by those skilled in the art.These layouts can use independently or in combination.Protruding 36 extend between rotor disk 32.Protruding 36 extend in a generally axial direction, and can include the sealing tooth 38 extended in a radial direction, to engage the stationary part of high pressure compressor 14.Although protruding 36 are shown as substantial linear, but they can be curve.

Along the outer surface 40 of tie bolt assembly 30, groove 42 is positioned in tie bolt 31.Groove 42 can around tie bolt 31 circumferentially.Groove 42 can extend around whole outer surface 40, or can around outer surface 40 less than 360 degree.Additionally, groove 42 can define along the single continuous groove 42 of circumferential direction, or can be limited by multiple discontinuous section circumferentially directions.

Groove 42 is substantially u shape on cross section, has the first side wall the 44, second sidewall 46 and seat 48.As paint, seat 48 generally axially extends between the sidewall 44,46 radially extended.Alternately, as paint, sidewall 44,46 can with seat 48 one-tenth non-perpendicular angles.But, this specific u shape and cross section are only an embodiment, and can use alternative cross section, shape and structure, e.g., and v tee section.Such as, seat 48 can angulation or by two or more sections but not painted single sections and formed.Seat 48 may also include location feature, and e.g., ratchet, boss or recess, for the location of spring 60.

Foot 50 extends from rotor disk 32.Foot 50 extends in a generally axial direction on groove 42.Although foot 50 is shown as substantial linear, but is used as curvilinear structures.Foot 50 has lower surface 52, and it is engaged by spring 60.Foot 50 can circumferentially direction extend about 360 degree as single structure, or can extend with two or more sections.Foot 50 allows side loading to be transferred to rotor assembly 15 from tie bolt assembly 30, and rotor assembly 15 provides the lateral-supporting for tie bolt 31.Additionally, the natural frequency engaging increase tie-rod bolt 31 between spring 60, tie bolt 31 and foot 50 so that natural frequency increases to above more than the enough nargin of power operation speed.

Foot 50 includes smooth lower surface 52 circumferentially, for engaging with spring 60.Lower surface 52 be positioned at groove 42 with on relative seat 48 or spaced radially apart with it.Lower surface 52 provides the upper limit, and seat 48 provides lower limit, both radially.Lower surface 52 also can have location feature, with by spring 60 held in place.Additionally, groove 42 provides the just axially location feature on tie bolt assembly 30 for spring 60.These features help to maintain the joint between part.

Foot 50 and seat 48 are spaced a distance, and it is less than the height 72 (Fig. 6) of spring 60, so that radial interference always exists between spring 60 and foot 50.This utilizes radial compression that preload puts on spring 60.When gas-turbine unit does not operate, spring 60 engaging foot 50.When gas-turbine unit operation and thermal expansion occur, spring 60 remains engaged with, regardless of the size variation being associated with the expansion of any one in rotor disk 32, foot 50, tie bolt 31 or spring 60.

Such as, due to the change Warm status during power operation, therefore the spacing between foot 50 and seat 48 can radially increase with rotor disk 32 and changes.Radial interference is more than the scope of the relative motion between foot 50 and seat 48, so that spring 60 engaging foot 50 continuously during transient operating conditions, steady-state operating conditions and between engine shut-down.

Spring 60 is generally plotted as inverted u shape.Spring 60 further describes in Figure 5, but includes the first spring foot 62 and the second spring foot 64, they joining bases 48 and peak portion or mid portion 66, peak portion or mid portion 66 engaging foot 50.Although according to the present embodiment, u shape is inverted, but in the scope of the present embodiment, spring 60 is reversed, so that spring 60 end engaging foot 50, and mid portion 66 engages tie bolt 31, and this is contrary with the structure painted in Fig. 3.

Also as seen in Figure 3, spring 60 has length in axial direction, and it is less than the length of groove 42.This allow that spring 60 is seated at wherein.It addition, this allow that spring 60 is axially moveable in groove 42 independent of bending, and do not transmit axially loaded.

Referring now to Fig. 4, it is shown that the embodiment of Fig. 3, wherein spring 60 bends, so that the end of spring 60 in axial direction promotes towards the sidewall 44,46 of groove 42.During the bending of spring 60, the end of spring 60 can in axial direction be moved.But, rotor disk 32 does not engage tie bolt assembly 30, regardless of radial direction or shifted laterally.Therefore, groove 42 has axial extent, and it is more than the axial extent of spring 60, to allow spring 60 this type of bending in axial direction.Additionally, as it was noted above, during operation, it is intended that spring 60 can slide along seat 48 in groove 42.What which prevent on spring 60 is axially loaded, still allows for the radially and laterally load between rotor assembly 15 and tie bolt assembly 30 simultaneously.

Referring now to Fig. 5, depict the isometric view of spring 60.The spring 60 of the present embodiment is substantially close to 360 degree continuously.But, the circumferential end 61,63 (Fig. 6) of spring 60 disconnects, to allow spring 60 around the location of tie bolt 31.Additionally, as indicated previously, spring 60 is divided into multiple sections 161 as shown in Figure 6, but not the substantially continuous structure as painted.One or more spring 60 has the first circumference end 61 and the second circumference end 63.Spring 60 includes the first axial end 68 and the second axial end 70, and the first spring foot 62 and the second spring foot 64 and mid portion 66 are between which.As indicated earlier, spring foot 62,64 is seated in the groove 42 of tie bolt 31.Foot 62,64 can at axial end place, or spring 60 can as paint and upsweep, to stop on present 48 surfaces of spring foot 62,64 fluting or otherwise to stop moving axially of spring 60.Mid portion 66 engaging foot 50, to provide the load paths between tie bolt assembly 30 and rotor assembly 15.

As it was noted above, spring 60 also can be inverted, so that spring foot 62,64 engaging foot 50, and the seat 48 of mid portion 66 engagement groove 42.Although additionally, illustrate u shape spring structure, but it will be apparent to one skilled in the art that and can use other spring structure, e.g., helical spring, the spring of balloon type or voltage biasing structure, or other further allowing for moving axially promote component.

Referring now to Fig. 6, depict the axial view of alternative spring 60 embodiment.Substituting single sections, multiple sections 161 are plotted as and are respectively provided with circumference end 71,73.Spring 60 is shown as has axial end 70 and height 72.Height 72 with the bending change of spring 60, as by comparison diagram 3 and 4 paint.About the bending of spring 60, end 70,68 (Fig. 5) is in axial direction moved, as shown in by comparison diagram 3 and 4.As indicated earlier with discussed, height 72 be following size, in order to the continuous interference fit between offer foot 50 and tie bolt 31.

Additionally, due to embodiment depicts the spring 60 being divided into multiple sections 161 circumferentially, therefore groove 42 can be formed by multiple circumference sections of the length of the sections 161 corresponding to spring 60.

Referring now to Fig. 7, spring 60 is plotted as at reverse or upside down position.Mid portion 66 is plotted as joint tie bolt 31, and spring foot 62,64 is plotted as the foot 50 of engagement rotator dish 32.

Although being described and illustrated herein multiple inventive embodiments, but those skilled in the art will easily dream up for performing function and/or one or more other device multiple obtaining in result specifically described herein and/or advantage and/or structure, and each in this type of modification and/or remodeling is recognized as in the invention scope of in this article described embodiment.More specifically, those skilled in the art will readily appreciate that, all parameters specifically described herein, size, material and structure mean as exemplary, and the parameter of reality, size, material and/or structure will depend upon which the teachings of the present invention specific one or multiple application for it.It would be recognized by those skilled in the art that many equivalents that only routine test maybe can be used to determine specific inventive embodiments specifically described herein.It will be appreciated, therefore, that previous embodiment only presents via example, and in the scope of claims and equivalent thereof, embodiments of the invention can practice except as specific descriptions and prescription.The inventive embodiments of the disclosure is for each independent characteristic, system, goods, material, external member and/or method specifically described herein.Additionally, any combination of two or more these category features, system, goods, material, external member and/or method (if this category feature, system, goods, material, external member and/or method are not conflicting) includes in the invention scope of the disclosure.

Example is for open embodiment (including optimal mode), and also enables those skilled in the art to put into practice equipment and/or method (including manufacturing and using any device or system and perform any method being incorporated to).That these examples are not intended to be exhaustive or the disclosure is limited to disclosed definite step and/or form, and much remodeling and modification in view of teachings above be possible.Feature specifically described herein can combine with any combination.The step of method specifically described herein can perform by physically possible any order.

Should be understood to prior to the definition in dictionary definition, the document that is incorporated by reference into any definition used as defined herein, and/or the common meaning of the term limited.As the indefinite article " " used in the specification and in the claims herein and " one " (unless clearly instruction on the contrary) should be understood to be meant to " at least one ".As use in the specification and in the claims herein phrase " and/or " should be understood to be meant to " any one or both " in the element of so connection, i.e. element that is that combine appearance in some cases and that separately occur in other situation.

It is to be further understood that in including any method of prescription herein of more than one step or action, the step of method or the order of action are not necessarily limited to the step of narration method or the order of action unless clear contrary instruction.

Claims

1. a tie bolt bearing assembly, including:

Axial Flow Compressor, it has multiple rotor disk and the multiple rotor blades extended from described rotor disk；

Extending axially through the tie bolt of described Axial Flow Compressor, described tie bolt has the circumferential recess that the external diameter around described tie bolt extends；

Spring, it is arranged in described groove and can move axially in described groove；

Described spring engages at least one in the plurality of rotor disk, to keep the radial force at least one rotor disk described.

2. tie bolt bearing assembly according to claim 1, it is characterised in that described spring has radial height, and it is more than the degree of depth of described circumferential recess.

3. tie bolt bearing assembly according to claim 2, it is characterised in that when described spring bending with when not bending, described spring keeps engaging with described rotor disk.

4. tie bolt bearing assembly according to claim 1, it is characterised in that described groove has axial length, it is more than the axial length of the described spring in normal condition.

5. tie bolt bearing assembly according to claim 1, it is characterised in that at least one rotor disk described also includes the foot engaging described spring.

6. tie bolt bearing assembly according to claim 5, it is characterised in that described foot in axial direction extends.

7. tie bolt bearing assembly according to claim 5, it is characterised in that described foot and described spring keep radial interference.

8. tie bolt bearing assembly according to claim 1, it is characterised in that described spring and engaging of described rotor disk provide the lateral-supporting for described tie bolt.

9. tie bolt bearing assembly according to claim 1, it is characterised in that described spring is substantially u shape.

10. tie bolt bearing assembly according to claim 9, it is characterised in that described spring also includes the first spring foot and the second spring foot.

11. tie bolt bearing assembly according to claim 10, it is characterised in that described first spring foot and described second spring foot engage described groove.

12. tie bolt bearing assembly according to claim 10, it is characterised in that described first spring foot and described second spring foot engage described rotor disk.

13. tie bolt bearing assembly according to claim 9, it is characterised in that described spring is generally peripheral.

14. tie bolt bearing assembly according to claim 13, it is characterised in that described spring has the first axial end 68 and the second axial end.

15. tie bolt bearing assembly according to claim 1, it is characterised in that described spring produces the lateral load path between described tie bolt and described rotor disk.